CAJ | 학술논문

某生物质循环流化床(CFB)锅炉运行中发现风帽表面出现沉积,采用多种方法对该类沉积进行了分析检测,研究发现其具有典型的分层结构.SEM和 EDS 以及 XRD分析表明：不同层之间的元素组成是类似的,K、Na、Cl 是构成沉积的主要元素,KCl 和 NaCl 等碱金属盐类是沉积的主要成分；气相碱金属盐类在风帽表面冷凝是初始沉积形成的主要方式,而局部高温是沉积发展的重要因素；保证流化质量,降低燃料中杂质可以抑制风帽表面沉积的形成.
모생물질순배류화상(CFB)과로운행중발현풍모표면출현침적,채용다충방법대해류침적진행료분석검측,연구발현기구유전형적분층결구.SEM화 EDS 이급 XRD분석표명：불동층지간적원소조성시유사적,K、Na、Cl 시구성침적적주요원소,KCl 화 NaCl 등감금속염류시침적적주요성분；기상감금속염류재풍모표면냉응시초시침적형성적주요방식,이국부고온시침적발전적중요인소；보증류화질량,강저연료중잡질가이억제풍모표면침적적형성.
Deposition occurred on surface of air nozzles in a biomass-fired circulating fluidized bed (CFB) boiler.Several measurement methods were applied to identify the compositions.Visual inspection shows the deposition has a typical layered structure.Detailed study was carried out by analyzing the sample via SEM (Scanning Electron Microscope),EDS (Energy Dispersive Spectrometer)and XRD (X-Ray Diffraction).It founds each layer of the deposition has similar elemental composition and K,Na,Cl are the main elements constituting the deposition.From the viewpoint of chemical compounds,alkali metal salts like KCl and NaCl are the main components.Condensation of alkali metal salts in gas phase on nozzle surface was con-sidered to be the major way by which the initial deposit formed,while the local high temperature was an important factor in the development of the deposit.Therefore,decreasing the heavy impurities from fuel and keeping high quality fluidization are effective to control the deposition formation on air nozzles.